Instruction manual
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AQ G3x7 Generator protection IED
107 (211
)
The formula above shows th
at the factors for multiplying R and L values contain different “ ”
factors but they are real (not complex) numbers.
The applied numerical method is solving the differential equation of the faulty loop, based on
the orthogonal components of the Fourier fundamental component vectors.
To achieve better filtering effect, the calculation is performed using the fundamental Fourier
components of the voltages, currents and current derivatives. The calculation results
complex impedances on the network frequency.
Figure 3-64: Impedance calculation principal scheme
The inputs are Fourier components of:
o
Three phase voltages,
o
Three phase currents,
o
Parameters.